Welcome!
Glad you're here! Hey, just a couple of pointers from a much, much older gal:
First, get good, accurate information. You will find good, accurate information at THIS website. There is lots and lots of bogus info on The Internet about transsexuality. Get your answers either here or from links here or from the people here. Susan's is renowned for having good information.
Second, if you are truly trans, and it sounds like you are, it will help you to get to know other people just like you. Again, this is a great place to do that. Jump in. Post anytime. Get involved.
Third, God, you are SO young. Like, so what? Well, just this: Your chances for a FANTASTIC transition (if that's what you want to do) are SUPERB! Many of us here really wish we could have started transitioning at age 19. Lastly, it's great that your sisters and friends are cool with you. Rock on! That's very important and will help you a lot!
Glad to have you here at Susan's Place ...

... Lacey Lynne.
P.S.:
Love your saying about California Girls! I'm in Oregon, so they are a bit (quite a bit) south of us here. Man, there was this song when I was a kid: "California Girls (Wish They All Could Be)" by The Beach Boys. This was probably even before your parents' time. Sigh, those were the days ...

That song was RIGHT!
The year was 1965. Check it out:Yours truly visited California in 1968 ... at age 13. God! LOVED IT!!!